Engine speed calculating apparatus

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EP 0 967 379 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	14.11.2001 Bulletin 2001/46

(43)	Date of publication A2:
	29.12.1999 Bulletin 1999/52

(21)	Application number: 99110409.2

(22)	Date of filing: 28.05.1999

(51)	International Patent Classification (IPC)⁷: F02D 41/34, F02D 41/02

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

26.06.1998 JP 18017098

(71)	Applicant: HONDA GIKEN KOGYO KABUSHIKI KAISHA
	Minato-ku Tokyo (JP)

(72)	Inventors:
	Hirakata, Yoshiaki, c/o Honda Gitjutsu Kenkyusho Wako-shi, Saitama (JP) Abe, Masahiko, c/o Honda Gitjutsu Kenkyusho Wako-shi, Saitama (JP) Iwata, Yasuo, c/o Honda Gitjutsu Kenkyusho Wako-shi, Saitama (JP)

(74)	Representative: Liska, Horst, Dr.-Ing. et al
	Weickmann & Weickmann Patentanwälte Postfach 86 08 20 81635 München 81635 München (DE)

(54)	Engine speed calculating apparatus

(57) [Problems to Be Solved]
An engine speed calculating apparatus (4,2,9,6,7,8) capable of calculating an engine speed without being affected by pulsating revolutions in a low engine speed range.
[Means for Solving the Problem]
A time required for a crankshaft of an engine to revolve through a predetermined angle is measured upon each completion of revolution through the predetermined angle, and an engine speed is calculated on the basis of measure result data of the time required for revolution through the predetermined angle. When the preceding calculated engine speed is determined to be lower than a predetermined engine speed, an engine speed is calculated on the basis of a time required for the crankshaft to revolve through an angle larger than the predetermined angle.

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